| 引用本文: | 喻建瑜,范栋琛,徐凯,孔祥平,郑俊超,戴强晟.混合级联多端直流系统的分阶段协调故障穿越策略[J].电力自动化设备,2022,42(6): |
| YU Jianyu,FAN Dongchen,XU Kai,KONG Xiangping,ZHENG Junchao,DAI Qiangsheng.Staged coordinated fault ride-through strategy for hybrid cascaded multi-terminal DC system[J].Electric Power Automation Equipment,2022,42(6): |
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| 摘要: |
| 混合级联多端直流系统整流器的反下垂特性削减了系统吸收功率盈余补偿的能力，进而导致故障穿越能力受限。提出了一种利用设备自身过流裕度抵御交流故障的保护方案，通过分阶段的协调控制策略实现不同程度的故障穿越。直流受端多个换流器按照预先制定的运行模式协调配合，疏散模块化多电平换流器(MMC)组送出功率能力受阻产生的系统盈余功率。仿真结果表明，该协调故障穿越策略无需在直流侧配置泄能装置，就可实现在不同故障深度下快速稳定过渡到预先设定的稳定运行点，提高了混合级联多端直流系统的故障穿越能力。 |
| 关键词: 混合级联多端直流系统 故障穿越 电压裕度 低压限流环节 |
| DOI：10.16081/j.epae.202204026 |
| 分类号:TM721.1 |
| 基金项目:国家自然科学基金资助项目(51807027)；国网江苏省电力有限公司科技项目(J2020084, J2020078) |
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| Staged coordinated fault ride-through strategy for hybrid cascaded multi-terminal DC system |
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YU Jianyu1, FAN Dongchen1, XU Kai2, KONG Xiangping1, ZHENG Junchao1, DAI Qiangsheng1
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1.Electric Power Research Institute of State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 211103, China;2.State Grid Corporation of China, Beijing 100031, China
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| Abstract: |
| The anti-droop characteristics of the rectifier in the hybrid cascaded multi-terminal DC system weaken the system capability of power surplus compensation, which leads to the limitation of fault ride-through capability. A protection scheme that relies on the equipment’s own overcurrent capability to against AC faults is proposed, and fault ride-through in different degrees can be realized by the staged coor-dinated control strategy. Multiple different converters at the DC receiving end coordinate and cooperate according to the pre-established operating modes to evacuate the system surplus power that caused by the blockage of the modular multilevel converter group. The simulative results show that the coordinated fault ride-through strategy can realize the rapid and stable transition to the preset stable operating point under different fault depths without the need to configure the discharge device on the DC side, which improves the fault ride-through capability of the hybrid cascaded multi-terminal DC system. |
| Key words: hybrid cascaded multi-terminal DC system fault ride-through voltage margin low voltage dependent current order limiter |
